Set Buffer Read_Only

  Determines whether EVE writes out the buffer on exiting if the buffer has
  been modified.

  Usage notes:

  o  By default, buffers you create (with BUFFER, GET FILE, NEW, or OPEN)
     are write-enabled. Thus, on exiting, EVE writes out your buffers if you
     made any changes and have not already written out the buffers.

  o  Typically you make a buffer read-only (also called write-locked) to
     prevent inadvertently changing text you want to keep intact, such as
     reference data or a previous draft.

  o  Making a buffer read-only also makes it unmodifiable. You can then make
     the buffer modifiable. Typically, you make a buffer read-only and
     modifiable if it is a "scratchpad" buffer in which you want to edit
     text but do not want EVE to write out the buffer on exiting.

  o  You can also toggle the read/write attribute by clicking M1 on the
     Read-only or Write indicator in the status line.

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  Related topics:

     Status Line     SET BUFFER     SHOW